21031210131011 has 4 divisors (see below), whose sum is σ = 22138115927400. Its totient is φ = 19924304334624.

The previous prime is 21031210130947. The next prime is 21031210131067. The reversal of 21031210131011 is 11013101213012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21031210131011 - 2⁶ = 21031210130947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031210131611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553452898166 + ... + 553452898203.

It is an arithmetic number, because the mean of its divisors is an integer number (5534528981850).

Almost surely, 2^{21031210131011} is an apocalyptic number.

21031210131011 is a deficient number, since it is larger than the sum of its proper divisors (1106905796389).

21031210131011 is a wasteful number, since it uses less digits than its factorization.

21031210131011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106905796388.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 21031210131011 its reverse (11013101213012), we get a palindrome (32044311344023).

The spelling of 21031210131011 in words is "twenty-one trillion, thirty-one billion, two hundred ten million, one hundred thirty-one thousand, eleven".